Apart from arbing and some matched betting offers; you won’t find a way to create a risk free profit on all three outcomes of football.
You can of course so things like the money back specials. Usually you’ll see “money back if A win” and money back if B wins” with two different bookmakers on big games and you can play these offers off against each other.
There’s always going to be some element of risk, especially with football. I think if you stick to the matched betting offers and check the daily calendar you’ll be ok.